Weaknesses and Resistances

Abilities

This Pokémon cannot have its stats [lowered]{mechanic:stat-modifier} by other Pokémon.
This ability does not prevent any stat losses other than [stat modifiers]{mechanic:stat-modifiers}, such as the [Speed]{mechanic:speed} cut from [paralysis]{mechanic:paralysis}. This Pokémon can still be passed negative stat modifiers through []{move:guard-swap}, []{move:heart-swap}, or []{move:power-swap}.
This ability functions identically to []{ability:white-smoke} in battle.

Whenever a Pokémon would heal after hitting this Pokémon with a leeching move like []{move:absorb}, it instead loses as many [HP]{mechanic:hp} as it would usually gain.
[]{move:dream-eater} is unaffected.

Hidden Power's power and type vary depending on the individual Pokemon using it, ranging between 30 and 70 power. There is no way to change a Pokemon's Hidden Power type or power, so you are stuck with what you have. Hidden Power is always a Special-based move.

Flavor

Pokedex

White: Because its body is almost entirely composed of water, it shrivels up if it is washed ashore.

Black: Because its body is almost entirely
composed of water, it shrivels up if
it is washed ashore.

Locations

Where to find Tentacool

Tentacool cannot be found in the wild in Pokemon Black or Pokemon White. This means the only ways you can obtain it are:
Use the Poke Transfer (requires National Dex) to transfer it from Diamond, Pearl, Platinum, HeartGold, or SoulSilver.

Tentacool is honestly as it's name says is pretty cool, sooner or later it comes so often it makes me lose my mind and I start ramming my head through the walls haha! but surprisingly enough Tentacool isn't in my pokedex yet... for now!